Battery life varies between the two (3.5 Hours vs 5 / 7 / 150 Hours), which affects how long you can use them on a single charge. boAt Airdopes 291 and boAt Airdopes 621 offer different noise cancellation capabilities (CVC vs NA), which can impact how effectively they block external noise. Impedance levels vary (22 ohm vs 16 ohm), which can affect compatibility and audio output when used with different devices. boAt Airdopes 291 and boAt Airdopes 621 are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment. Both models provide a wide frequency range, delivering a balanced audio experience across different types of content. There is a noticeable difference in weight (8 gm vs 129 Gm), which may affect comfort during extended use.

Verdict: Choosing between boAt Airdopes 291 and boAt Airdopes 621 depends on whether you value better sound, longer battery life, or enhanced features.